Bookcase block



FIG. 1 is a perspective view of the bookcase block.

FIG. 2 is a front view thereof.

FIG. 3 is a back view thereof.

FIG. 4 is a bottom view thereof.

FIG. 5 is the top view thereof.

FIG. 6 is a side view thereof; and,

FIG. 7 is the other side view. 

The ornamental design for a bookcase block, as shown and described. 